Value Collection ZMSCH90261 O-ring 6.75 in Id Nbr Dash 261

Product Description

The VALUE COLLECTION ZMSCH90261 is a Buna-N (nitrile butadiene rubber) O-ring engineered for sealing applications in fluid and pneumatic systems. With a 6.75-inch inside diameter, 7-inch outside diameter, and a 0.125-inch cross-section thickness, this is a Dash 261 standard-size O-ring. It is rated at 90 durometer, placing it in the extra-hard hardness category. The operating temperature range spans -40 degrees F to 250 degrees F, making it suitable for both cold-storage and moderate-heat environments. Licensed plumbers, HVAC technicians, and industrial maintenance mechanics regularly work with O-rings of this size in large-bore flange, valve, and pipe fitting applications.

This O-ring is compatible with petroleum-based fluids and lubricants, making it a practical choice for hydraulic systems, fuel lines, compressor assemblies, and related plumbing or mechanical installations. The Dash 261 designation corresponds to a widely recognized AS568 standard sizing, so it fits wherever that cross-section and diameter are specified. The black Buna-N compound provides strong compression set resistance along with good tear and abrasion resistance under cyclic load. It is sold in a package of 10 and is not FDA approved, so it is not intended for food-contact or medical-grade applications.

Key Features

• Buna-N elastomer with excellent resistance to petroleum products and hydraulic fluids
• Extra-hard 90 durometer rating for applications requiring firm seating and low creep
• Wide service temperature range: -40 degrees F to 250 degrees F
• Dash 261 standard sizing for drop-in replacement in AS568-dimensioned grooves
• Round cross-section profile for consistent radial and face-seal performance
• Meets SAE and MIL-Spec standards

Compatibility

Compatible with petroleum products and related fluid media. Designed as a standard Dash 261 O-ring replacement for large-bore sealing applications in hydraulic, plumbing, and mechanical assemblies where Buna-N elastomer is specified. Store away from direct sunlight, ozone sources, and electrical equipment that may generate ozone to preserve elastomer integrity.

Installation Notes

O-ring installation of this size is typically performed by licensed plumbers, HVAC technicians, or industrial mechanics during valve, flange, or compressor service. De-energize the system and relieve all pressure before removing the old O-ring. Inspect the groove for nicks, burrs, or corrosion that could damage the sealing surface. Lightly lubricate the O-ring with a compatible fluid before seating it to reduce the risk of tearing during assembly.